Carburetor-accelerating means



July 15, 1930. G. M. HOLLEY 1,770,404

I CARBURETOR ACCELERATING 'MEANS F'iled Sept. 1, 1927 2 Sheets-Sheet l J, V p H HQ G 1 I 0 P J i f 2 a g z.

INVENTOR M ATTORNEY Patented July 15, 1 9;,0

UNITED STATES GEORGE m. HOLLEY, or DETROIT, MICHIGAN CARBUEETOR-ACCELERATING MEANS Application filed September 1, 1927. Serial No. 216,830. I

The object of this invention is to improve the acceleration of an automobile operated by an internal combustion engine, provided with an explosive mixture produced in a carburetpr in which a gravity fed fuel nozzle discharges under the influence of the indrawn air.

Specifically the object of this invention is to provide improved means operated by 10 the carburetor throttle located in the mixture outlet, which will provide the necessary increased fuel supply needed during acceleration, and will automatically regulate the amount so as to provide more fuel when the throttle is opened rapidly, and less when the throttle is opened slowly.

A second object is to provide means whereby the initial movement of the throttle is relatively ineffective to provide the increased fuel supply for acceleration, as com-v pared with the later portion of the throttle movement towards the wide open position.

Figure 1 shows the preferred form of the accelerating device applied to a double Venturi carburetor of a well known type. In order to make the clearest disclosure the parts are shown in one plane in partial sec tional elevation. I I

Figure 2 shows a partial section on plane 2% of Figure 1. 1- I Figure 3"sh0ws. a slight modification of the same invention disclosed in Figure 1.

known manner. D is the high speed nozzle,

(unvented) discharging into the -throat of C and fed from. the float chamber through the passageF. G is the compensating nozzle also discharging into C and air vented 'through the restricted o ening H, which feeds air from the atmosph ranged one abgve the other.

Gasoline is supplied to G through the passage K, controlled by the needle '13. The explosive mixture supply to the engine is con:

totr'olled by the throttle I, to which is conthe cylinder 0.- A horizontal assage V 10- through which it issues to the smal 'which is in communication with O ere into this noz-' zle G through plurality of openings-J, ar-

nected a lever L which contacts with the end of the rod M to which is connected the displacer orplunger N, which is provided with ears (like keys) (Fig. 2) which guide it up and down in the cylinder 0.. A spring P tends to raise the displacer N,:'so as to keep the upper end of the rod M in contact with the lever L. A non-return valve Q, is located in the bottom of the cylinder 0. Gasoline is fed to 0 through the passage R. A passage S is provided communicating with 0 through the drilled plugs T, for a purpose to be described. A vent U leads air into the enclosed space above the open upper end of cated above the level' X-X al ows fuel displaced by the dis'placer N to flow into C, being carried along and sprayed by air drawn in at U in a well known manner.

In Figures 3 and 4, the displacer N is provided with a groove'or slot W, withwhich a ball Z engages. This ball serves to keep the groeve or slot W in line with the outlet V. A slight spring Y causes the ball to engage with the groove. A low speed fuel nozzle D is shown independently fed from the fuel reservoir and discharging in advance of the I throttle valve into the mixture outlet.

' "In Figure 1 a low speed nozzle P V also provided discharging adjacent to and 1n ad- Vance; of the lower of the butterfly throttle. Figure 4 shows a partial section on plane pemtz'0n'.-On opening the throttle su ddenly (Figs. 1, and 2) the -fuel-in ;O is dlsplaced by ithe descent of the plunger N and fuel rises above the level of the passage V,

er venturi C. Meanwhile air is drawn in through U and the fuel therefor is aspirated as it issues into the throat .of the venturi C. 'W'hen the throttle is opened slowly fuel leaks back 1nto the float chamber through the passage S,

through 8 the restricted-outlet T T.

' In; Figures 3 and 4 similar results are ob tained, exceptzthat'the action is more positive if tliev throttle-is completely opened. The reason for t is that as the displacer or f plunger N descend it closes and seals the overflow bypasses T T T, so that the further (and faster) the displacer N descends the more positively is the fuel discharged into the mixing chamber C, and it is when the throttle is completely opened and opened quickly that the need for extra fuel is most cr1tical.

What I claim is 1. In a carburetor having a constant level fuel supply chamber, a fuel nozzle connected thereto, a mixing chamber into which the nozzle discharges, a mixture outlet, a throttle valve therein, means for supplying an additional and temporary fuel supply, comprising a cylinder, a submerged passage connecting said cylinder to said supply chamber, a check valve in said passage, a displacer in said cylinder operated by said throttle so as to descend as the throttle opens, a passage located above the level in said constant level supply chamber connecting said cylinder with said mixing chamber, an atmospheric communication leading to the upper portion of said cylinder through which aspirating air is adapted to flow to said mixing chamber, a bypass located below the level of fuel in said constant level fuel supply chamber and lead ing from said cylinder back into said con stant level chamber, a restriction in said bypass. a I

2. In a carburetor having a constant level fuel supply chamber, a fuel nozzle connected thereto, a mixing chamber into which the nozzle discharges, a mixture outlet, a throttle valve therein, means for supplying an additional and temporary fuel supply comprising a cylinder, a submerged passage connecting said cylinder to said supply chamber, a check valve in said passage, a displacer in said cylinder operated by said throttle so as to descend as the throttle opens, a passage located above the level in said constant level supply chamber connecting said cylinder with said mixing chamber, an atmospheric communication leading to the upper portion of said cylinder through which aspirating air, is

adapted to flow to said mixing chamber, a

, bypass leading to said supply chamber from said cylinder, a restricted passage in said bypass. v

3. In a carburetor having a' constant level fuel supply chamber, a fuel nozzle connected thereto, a mixing chamber into which the nozzle discharges, a mixture outlet, a throttle valve therein, means for supplying an additional and temporary fuel supply comprising a c hnder, a submerged-passage connecting sal cylinder to said supply chamber, a check valve in said passage, a displacer'in said cylinder operated by said throttle so' as to descend as the throttle opens,'a, passage located above the level in said constant level supplyv chamber connecting said cylinder with said mixing chamber, an atmosphericcommunication leading to the upper portion of said cylmder through which aspirating air is adapted to flow to said mixing chamber, a bytional and temporary fuel supply comprising a cylinder, a submerged passage connecting said cylinder to said supply chamber, a check valve in said passage, a displacer in said cylinder operated by said throttle so as to descend as the throttle opens, a'passage located above the level in said constant level supply chamber connecting said cylinder with said mixing chamber, an atmospheric communication leading to the upper portion of said cylinder through which aspirating air is adapted to flow to said mixing chamber, a restricted bypass leading to said supply chamber and connected to said cylinder through a plurality of restricted passages located at difl erent levels belowthe level in said supply chamber, said displacer being adapted durlng the operating stroke to successively obstruct the fiow of asoline through said passages.

fl'l testimony whereof I affix my signature.

GEORGE M. HOLLEY. 

